Abstract
The concept of interlocked ortho-grid core was very attractive, due to great mechanical properties, low cost, and simple processing. However, the rib intersection aroused by this interlocking method was always the weak link where stiffness reduction and failure initiates occurred. In this paper, the low-velocity impact behaviors of the interlocked ortho-grid composite sandwich structure with two typical impact positions and three impact energy were designed and studied experimentally and numerically. The best match relationship between the adjacent ribs was revealed and mainly discussed considering three heights of slot. Besides, the different typical damage responses and damage modes were also observed and discussed. At the impact position of rib intersection, this sandwich structure exhibited a progressive crushing damage, and the prominent damage mode was matrix fracture. The interlocked method with slot using half of rib height represented the best match between adjacent ribs compared with others, illustrating the best impact bending stiffness. A refined finite element model based on progressive damage was established to research the damage mode and sequence, which was not observed at experiments. The present study provided a series of experimental and numerical results, which could be utilized as design reference guidance in the designing of light-weight structures.
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